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Similar to Is it possible to create a new operator in c#?, is it possible to create your own operator for Java? I would initially say no since you can't overload, but then again, String supports + and += (implicitly through StringBuilder at execution time etc).
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Custom operators are also known as advanced operators and allow you to combine two instances with a self-chosen infix, prefix, postfix, or assignment operator.
Your answer Java doesn't supports operator overloading because it's just a choice made by its creators who wanted to keep the language more simple. Every operator has a good meaning with its arithmetic operation it performs. Operator overloading allows you to do something extra than what for it is expected for.
C++ supports operator overloading, but you are not allowed to create your own operators.
No, Java is not extensible in this way. You can't add operators, and you can't even further overload built-in operators like + - even standard library classes like BigInteger have to use methods such as add() rather than operators such as +.
Scala (another static JVM language) gets around this by using method calls rather than built-in operators, and allowing any characters in method names, so you can define new methods that appear to be operators, i.e.
a + 1
is syntactic sugar for:
a.+(1)
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